You can choose a set of templates saved in your sandbox space by using an appropriate sandbox prefix. For example, if you want to preview a version of ಟೆಂಪ್ಲೇಟು:Test that you have saved as "ಸದಸ್ಯ:Foo/sandbox/ಟೆಂಪ್ಲೇಟು:Test", use "ಸದಸ್ಯ:Foo/sandbox" as the prefix.